Simplex Trading Portfolio holdings
Simplex Trading, founded in 2004 and headquartered in Chicago, Illinois, is a technology-driven proprietary trading firm specializing in market-making and liquidity provision, primarily in U.S. equity options and futures options. Leveraging advanced proprietary software and data-driven analysis, the firm optimizes trading strategies and develops innovative solutions to capitalize on financial market opportunities, maintaining a competitive edge through automation and a collaborative team of technologists and traders. With a workforce exceeding 300 and led by CEO Erik Swanson since 2014, Simplex operates with a low-ego, high-intelligence culture, focusing on minimal bureaucracy and rapid execution, while also making strategic venture capital investments in fintech startups. Recognized as a top workplace in Chicago by Built In’s 2025 awards, Simplex continues to evolve, blending cutting-edge technology with a commitment to market efficiency and growth.
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$113M |
| 2 |
SPDR Gold Trust
GLD
|
+$68.6M |
| 3 |
NVIDIA
NVDA
|
+$63.4M |
| 4 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$55.2M |
| 5 |
Apple
AAPL
|
+$54.9M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Netflix
NFLX
|
+$27.1M |
| 2 |
Qualcomm
QCOM
|
+$24.6M |
| 3 |
Walt Disney
DIS
|
+$21.2M |
| 4 |
Advanced Micro Devices
AMD
|
+$18.2M |
| 5 |
Snowflake
SNOW
|
+$16.1M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.44% |
| 2 | Consumer Discretionary | 0.32% |
| 3 | Healthcare | 0.22% |
| 4 | Financials | 0.17% |
| 5 | Communication Services | 0.15% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
3126
PUT
Teekay Tankers
TNK
$2.63B
| $645K | ﹤0.01% |
15,500
+2,300
| +17% | +$93.9K |
|
3127
Recursion Pharmaceuticals
RXRX
$1.6B
| $643K | ﹤0.01% |
84,110
+82,693
| +5,836% | +$825K |
|
3128
CALL
John B. Sanfilippo & Son
JBSS
$978M
| $642K | ﹤0.01% |
+6,500
| New | +$684K |
|
3129
CALL
Accuray
ARAY
$26.8M
| $641K | ﹤0.01% |
236,000
+155,800
| +194% | +$514K |
|
3130
CONMED
CNMD
$1.31B
| $641K | ﹤0.01% |
+6,360
| New | +$731K |
|
3131
Designer Brands
DBI
$298M
| $641K | ﹤0.01% |
50,700
-89,338
| -64% | -$954K |
|
3132
CALL
Tenaris
TS
$28.5B
| $641K | ﹤0.01% |
20,300
-1,200
| -6% | -$38.8K |
|
|
SGI
3133
CALL
Somnigroup International
SGI
$15.3B
| $641K | ﹤0.01% |
14,800
+6,100
| +70% | +$270K |
|
3134
PUT
Allot
ALLT
$373M
| $640K | ﹤0.01% |
293,700
+148,100
| +102% | +$365K |
|
3135
CALL
CGI
GIB
$14.5B
| $640K | ﹤0.01% |
6,500
+5,500
| +550% | +$562K |
|
|
SRG
3136
PUT
Seritage Growth Properties
SRG
$133M
| $640K | ﹤0.01% |
82,800
-285,700
| -78% | -$2.4M |
|
|
JOYY
3137
CALL
JOYY Inc
JOYY
$3.77B
| $640K | ﹤0.01% |
16,800
+3,100
| +23% | +$107K |
|
3138
CALL
Canadian National Railway
CNI
$78B
| $639K | ﹤0.01% |
5,900
-10,600
| -64% | -$1.22M |
|
3139
CALL
CVR Energy
CVI
$3.43B
| $639K | ﹤0.01% |
18,800
+7,500
| +66% | +$256K |
|
|
GMS
3140
CALL
DELISTED
GMS Inc
GMS
| $639K | ﹤0.01% |
10,000
-36,900
| -79% | -$2.56M |
|
|
PPLI
3141
PUT
People Inc
PPLI
$3.15B
| $639K | ﹤0.01% |
15,481
+3,291
| +27% | +$160K |
|
|
ESTE
3142
PUT
DELISTED
Earthstone Energy Inc. Class A Common Stock
ESTE
| $639K | ﹤0.01% |
31,600
-2,000
| -6% | -$34.9K |
|
3143
CALL
MoonLake Immunotherapeutics
MLTX
$1.66B
| $638K | ﹤0.01% |
+11,200
| New | +$618K |
|
3144
Madison Square Garden
MSGS
$9.57B
| $638K | ﹤0.01% |
+3,622
| New | +$682K |
|
3145
CALL
Rollins
ROL
$18.8B
| $638K | ﹤0.01% |
17,100
+13,000
| +317% | +$525K |
|
|
CFLT
3146
DELISTED
Confluent
CFLT
| $637K | ﹤0.01% |
21,529
-49,721
| -70% | -$1.67M |
|
3147
PUT
Cognex
CGNX
$10.2B
| $636K | ﹤0.01% |
15,000
+14,500
| +2,900% | +$713K |
|
3148
CALL
Fiverr
FVRR
$398M
| $636K | ﹤0.01% |
26,000
-17,200
| -40% | -$484K |
|
3149
PUT
Jefferies Financial Group
JEF
$13B
| $635K | ﹤0.01% |
18,200
| – | – |
|
3150
CALL
Talos Energy
TALO
$2.36B
| $634K | ﹤0.01% |
38,600
-2,600
| -6% | -$41.8K |
|
Similar funds
Simplex Trading's Q3 2023 Portfolio in Review
As of Q3 2023, Simplex Trading held 10,417 positions worth $127B, up 4.5% from $122B the previous quarter. Its ten largest holdings account for 44% of the portfolio.
Simplex Trading deployed $11.9B of net new capital in Q3 2023, opening 1,399 new positions and adding to 3,690 existing holdings. Its largest new stake was Amazon: 841,102 shares worth $107M.
By sector, the portfolio is most concentrated in Technology at 0.44% of assets, up from 0.41% a quarter earlier, followed by Consumer Discretionary and Healthcare.
On the sell side, the largest reduction was Netflix, an estimated $27.1M trimmed.
- Simplex Trading's largest Q3 2023 buy was Amazon: 841,102 shares worth $107M.
- Simplex Trading added most to SPDR Gold Trust in Q3 2023, an estimated $68.6M increase.
- Simplex Trading's biggest Q3 2023 reduction was Netflix, cutting an estimated $27.1M.
- Simplex Trading fully exited Qualcomm in Q3 2023, selling an estimated $24.6M.
- Simplex Trading's ten largest holdings make up 44% of its $127B portfolio in Q3 2023.
- Simplex Trading opened 1,399 new positions and closed 1,719 in Q3 2023.
- Simplex Trading's portfolio value rose 4.5% quarter-over-quarter to $127B.
Based on Simplex Trading's 13F filing for Q3 2023, filed 1 Nov 2023.